Trim after explicit gc.

  On Gingerbread, dvmHeapSourceTrim() is called 5 seconds
  after every kind of GC. Current AOSP do trim only for
  concurrent GC. That makes OOM killer too busy.

  At least explicit GC need trim and in case of explicit
  GC, there are no need to delay 5 seconds before trim.

Change-Id: I8fde8f773398bf20c674cfa6f686d7d745d56492
3 files changed